Rock-drilling machine.



No. 710,922. Patented ct. 7, |902.

W. PRELLWITZ.

ROCK DBILLINE MACHINE.

(Application :Bled Jan. 7. 1902.)

(No Model.)

@JV/dname@ l mvenxom b I man Usern@ Sterns PATENT nuten.

VILLIAM PRELLWITZ, OE EASTON, PENNSYLVANIA, ASSIGNOR TO THE INGERSOLL-SERGEANT DRILL COMPANY, OF NE'XV YORK, N. Y., A OOR- PORATION OF VIEST VIRGINIA.

ROCK-DRLLiNG MACHlN'E.

SPECIFICATION forming part of -Letters Patent No. 710,922, dated October '7, 1902.

Application tiled January 7,1902. Serial No. 88,739. (No model.)

To (all wit/mt it' 77cm/ concern:

Be it known that I, WILLIAM` PRnLLwrrZ, a citizen of the United States, and a resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Rock-Drilling Machines, ot' which the following is a specilication.

My invention relates to an improvement in rock-drilling machines, and more particularly to improvements in feeding` water in the required quantity to the face of a drill.

Another object of my invention is to provide means under the control of the reciprocating movement of the piston for feeding water intermittently to the face of the drill, whereby the water may be fed thereto during a certain portion only ot' the stroke of the drill-as, for instance, for the last part of the advance stroke and the first part of the return stroke.

A further object is to provide certain improvements in the construction, form, and

arrangement ofthe several parts whereby the Y above objects may be carried out in a simple and effective manner.

A practical embodiment of my invention is represented in the accompanying drawings, in which- Figure 1 represents in side elevation, partly in section, so much of a rock-drilling machine as will enable a complete understanding of the invention, the piston and the parts carried thereby being shown at the limit of their forward movements. Eig. 2 is a view in side elevation, partly in section, ot'the cylinder, the water-feed front head, and a portion ofthe drill-carrying piston, the parts being shown at right angles to that shown .in Fig. 1, -the piston being at the limit of its rearward movement. Fig. 3 is an enlarged detail view showing the means for feeding the water intermittently to the drill, the piston being shown at a point about midway its stroke. Fig. t is a transverse section taken in the plane of the line A A of Fig. 3 in the direction of the arrows, and Eig. 5 is a face view of the drill.

The cylinder is denoted by 1, which cylinder is connected by suitable ducts 2 and 3 with the valve-chest for feeding the actuating fluid to the cylinder upon opposite sides of the piston. The piston-head is denoted by 4 and its rod by 5, which rod is provided with the usual chuck 6 at its forward endifor the attachment of a drill 7.

The drill 7 has a hole S extendedlongitudinally therethrough, forming a water-feeding duct in connection with the piston-rod, as will hereinafterappear, when the drill is held in position within the piston-rod.

The piston-rod 5 is provided with a longitudinal water-feeding duct therein, which in the present instance is formed by a hole 9, drilled from the front end part of the way inwardly, and transverse holes 10, leading from the inner end ot the hole 9 outwardly to the periphery of the rod.

A tubular front head 11 is secured at one end of the cylinder 1, within which head the piston-rod 5 is fitted to slide as the piston is reciprocated. This front head 11 is provided with a water-feed chamber surrounding the piston-rod, which water-feed chamber in the present instance comprises a plurality of transverse annular grooves 12, connected by a longitudinal groove 13, so as to prevent the undue cutting away of the bearing of the piston-rod. n

A main water-pipe 14: leads from a suitable source of supply to the inlet 15, leading to the water-feed chamber in the front head, which pipe 14 is preferably provided with the usual needlevalve 16 for accurately regulating the supply ofwater to the said waterfeed chamber.

The watenfeed chamber in the front head is so arranged that open communication is established for feeding water to the face of the drill during the last part of the forward stroke and the rst part of the rearward stroke of the piston.

A packing-ring 17 surrounds the pistonrod within the front head 11 in close proximity tothe rear end of the Water-feed chamber, so as to prevent the water from creeping up along the piston-rod as the piston-rod is slid rearwardly.

A second packing-ring 1S surrounds the piston-rod 5 adjacent to the cylinder 1,which IOO packing-ring is so located that the rear open end of the water-feeding duct in the pistonrod Will be to the front of the said packingring when the piston-rod is atthe limit of its rearward movement. This packing ring serves to prevent the escape of the motive fluid from Within the cylinder along the piston-rod to the said inner end of the longitudinal Water-feeding duct therein.

In Fig. et I have shown a packing-ring such as I prefer to use for insuring a perfect packing of the rod.

For convenience in setting up the parts I preferably construct the front head ll of two longitudinal sections secured rigidly together bya plurality of bolts 19 upon opposite sides of the piston-rod 5.

A stufng-box 2O may be provided at the front end of the Water-feed front head ll.

By the use of the device as hereinabove described I am enabled to feed the Water in the desired quantity to the face of the drill. This feature is of very great consequence, especially When the machine is used in connection With coal-mining,where it is desirable to have the smallest possible Waste of Water. It will be further seen that the Water may be fed to the face of the drill in a very simple and effective manner and in such a Way that there is no extra Water-feed pipe in the Way of the piston-rod and drill.

It is evident that changes might be resorted to in the form, construction, and arrangement of the several parts Withoutdeparting from the spirit and scope of my invention. Hence I do not Wish to limit myself strictly to the structure herein set forth; but

l. A cylinder, a drill-holding piston having a longitudinal Water-feeding duct therein, a front head having a Water-feed chamber therein and means for reciprocating the piston to open and close communication between the chamber and duct.

2. A cylinder, a drill-holding piston having a Water-duct leading from the front end of the piston-rod rearwardly therein and thence outwardly to the periphery of the rod, a front head having a Water-feed chamber surrounding the piston-rod and means for reciprocating the piston to bring the duct into and out of communication with the Water-feed chamber for feeding Water intermittently to the drill.

3. A cylinder,a drill-holding piston, the piston-rod having a Water-feeding duct therein comprising a longitudinal hole extending rearwardly from the front end of the rod and a transverse hole leading therefrom to the periphery of the rod, a front head having a Water-feed chamber therein and means for reciprocating the piston for openin g and closing communication between the said transverse hole and the Water-feed chamber.

4. A cylinder, a tubular front head having a Water-feed chamber therein, a piston having its rod fitted to reciprocate in the front head, the said rod havinga longitudinal Waterfeeding duct therein, arranged to be brought into and out of communication with the Waterfeed chamber when the rod is reciprocated, and a packing-ring surrounding the pistonrod adjacent to the Water-feed chamber for preventing the escape of the Water from the Water-feed chamber to the said duct, When the rod is in a certain position.

5. A cylinder, a tubular front head havin'g a water-feed chamber therein, a piston having its rod tted to reciprocate in the front head, the said rod having a longitudinal Waterfeeding duct therein, in communication with the water-feed chamber and packing-rings surrounding the piston-rod adjacent to the cylinder and to the Water-feed chamber for preventing the escape of the piston-actuating means into the longitudinal duct and for preventing the escape of the Water from the Water-chamber to the said duct when the piston-rod is in certain positions.

6. A tubular front head havinga water-feed chamber therein comprising a plurality of transverse annular grooves in its bore and a longitudinal channel connecting the several transverse annular grooves.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two Witnesses, this 4th day of January, 1902.

XVILLIAM PRELLVITZ.

W'itnesses:

HARRY VAN BILLIARD, TARD RAYMOND. 

